On April 21, 1991 — In the greatest extra-inning comeback in major league history, the Pittsburgh Pirates score six runs in the bottom of the 11th inning to erase a five-run Cubs lead built in the top of the inning on Andre Dawson’s grand slam. The Pirates had rallied earlier from a 7 – 2 deficit to tie the game in the 9th.
Here is the play by play for the 12th –
PIRATES 11TH: DWIGHT SMITH REPLACED DAWSON (PLAYING RF); Lind walked; Wilkerson singled to right [Lind to second]; Merced singled to left [Lind to third, Wilkerson to second]; BIELECKI REPLACED SLOCUMB (PITCHING); Bell doubled to third [Lind scored, Wilkerson scored, Merced to third]; Van Slyke out on a sacrifice fly to center [Merced scored (RBI), Bell to third]; Bonilla walked; Bonds singled [Bell scored, Bonilla to third]; REDUS BATTED FOR PATTERSON; Redus walked [Bonds to second]; Slaught doubled to center [Bonilla scored, Bonds scored, Redus to third]; 6 R, 5 H, 0 E, 2 LOB. Cubs 12, Pirates 13.